Question on upgrading from win 7 home premium 32bit to 64 bit

So I have a Sattelite L455D.  I upgraded the ram to four gigs however I can't utilize one gig of it well because of the 32bit limitations.  The stock proccesor is capable of running 64bit.  So I want to upgrade to 64 bit.
Now based on my research the retail installation disc would've came with the option to install both versions.  However my specific laptop did not come with any back up dics or anything of that nature.  So If I was to do a factory out of the box reset would I get prompted on which version to install?  IF not is there ANY work around without having to go out and buy a retail win 7 disc?
Thanks,
Ed.

Satellite L455D-S5976
Downloads here.
You would need to install a retail copy of 64-bit Windows 7 and then install all of the drivers and utilities that make it work properly on your model. It's not a minor undertaking. And there is always the chance that you won't be able for one reason or another to get things working right.
If you install 64-bit Windows Home Premium, you are entitled to activate it for free.
32-bit Windows supports 4 of your 8 GB. Our computers here with several Office 2010 applications running rarely require more than 2 GB and never approach 3 GB.
If you run heavy-duty applications like video editing or CAD, you'll want access to all 8 GB of course.
I can help a bit more if you decide to go ahead with this project.
-Jerry

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